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Reportable Segment Information (Details) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2026 USD ($)	Mar. 31, 2025 USD ($)	Mar. 31, 2026 USD ($) segment	Mar. 31, 2025 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			1
Net revenues	$ 503.8	$ 403.2	$ 965.6	$ 817.5
Less:
Income from continuing operations	45.3	38.3	13.1	132.2
Reportable Segment
Segment Reporting Information [Line Items]
Net revenues	503.8	403.2	965.6	817.5
Less:
Labor cost	123.5	98.3	239.3	205.0
Materials	86.4	71.7	164.8	146.2
Other service delivery costs	106.9	82.7	202.0	162.9
Advertising	21.1	17.5	41.2	34.8
Payroll and related costs	38.5	30.5	74.2	58.1
Other general and administrative	39.1	35.6	90.1	71.1
Other segment items	43.0	28.6	140.9	7.2
Income from continuing operations	$ 45.3	$ 38.3	$ 13.1	$ 132.2

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